Another option of smoothing is theoption. This option will create a smooth fillet of corners of two different curves. If applied to a single curve the beginning and end of the curve will be blended together.
Select two curves, execute the command, and if necessary, with the help of history, change the values like radius in the channel box.
The direction of the blended curve depends on the direction the extended curves would intersect. If a fillet gives an error, you need to reverse the curve direction. Adjusting the options in the Option Box will give added control of the fillet beforehand, or change values later in the channelbox.
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